hello,
Sorry, I’m french. I want to delete “Thème par Colorlib. Propulsé par WordPress” and just keep “2017 Seiraz. All rights reserved”.
Thank you for you help 
Hi Sarah,
Thank you for your question.
Use the child theme solution shared in the following topic to achieve this.
https://colorlibsupport.com/t/change-theme-by-colorlib-powered-by-wordpress-in-footer/
Best Regards,
Movin